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Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2019
Significant Accounting Policies [Abstract]  
Disclosure of principal subsidiaries and their geographic location [Table Text Block]
Entity Jurisdiction
Osisko Bermuda Limited Bermuda
Barkerville Gold Mines Ltd.(i) British Columbia
Coulon Mines Inc. Canada
General Partnership Osisko James Bay Québec
Osisko Mining (USA) Inc. Delaware

(i) From November 21, 2019 (Note 7).
Disclosure of detailed Information about financial instruments [Table Text Block]
Category Financial instrument 
   
Financial assets at amortized cost Bank balances and cash on hand 
  Short-term debt securities
  Notes and loans receivable
  Trade receivables
  Interest and dividend income receivable
  Amounts receivable from associates and other receivables
  Reclamation deposits (term deposits)
   
Financial assets at fair value through profit or loss Investments in derivatives and convertible debentures
   
Financial assets at fair value through other comprehensive income or loss Investments in shares and equity instruments, other than in derivatives
   
Financial liabilities at amortized cost Accounts payable and accrued liabilities
  Liability component of convertible debentures
  Borrowings under revolving credit facilities
Disclosure of detailed information about estimated useful life or depreciation rate [Table Text Block]

Leasehold improvements Lease term

Furniture and office equipment 3-5 years

Exploration equipment and facilities 3-20 years

Mining plant and equipment (development) 5-20 years